The `.create()` method does not support writable nested fields by default.

Using Django Forms & APIs
1

I am using Django Rest Framework to build a job board, while creating an option for users to create job postings, I receive the error

AssertionError at /jobs/create

The .create() method does not support writable nested fields by default. Write an explicit .create() method for serializer afritechjobsapi.serializers.PostAJobSerializer, or set read_only=True on nested serializer fields.

Reading the documentation for writing nested serializers - Serializer relations - Django REST framework I see that there is an example of how to tweak serializers to define a ‘create method’.

In the example seen on DRF documentation and other examples I’ve seen on stackoverflow - python - django - making .create() support writable nested fields? - Stack Overflow and Python Django Rest Framework: The `.create()` method does not support writable nested fields by default - Stack Overflow and python - Serializers.validated_data fields got changed with source value in DRF - Stack Overflow they are trying to create one nested serialization however I am working with many as seen below;

VIEWS.PY

@api_view(['POST'])
def post_a_job(request):
    if request.method == 'POST':
        post_a_job_serializer = PostAJobSerializer(data=request.data)
        if post_a_job_serializer.is_valid():
            post_a_job_serializer.save()
            return Response(post_a_job_serializer.data, status=status.HTTP_201_CREATED)
        return Response(post_a_job_serializer.errors, status=status.HTTP_400_BAD_REQUEST)

URLS.PY

path("jobs/create", views.post_a_job, name="post_a_job"),

MODELS.PY

   
class JobSkills(models.Model):
    class SkillsChoices(models.TextChoices):
        DJANGO = 'DJ', 'Django'
        REACT = 'RT', 'React'
    #TODOmore things to be added
    #TODOskills options should change based on the selected category

    title = models.CharField(max_length=20, choices=SkillsChoices.choices, default=SkillsChoices.DJANGO)
    category = models.ManyToManyField(Category)

    def __str__(self):
        return self.title

class JobLocations(models.Model):
    name = models.CharField(max_length=50)

    def __str__(self):
        return self.name
    
class JobType(models.Model):
    class JobTypeChoices(models.TextChoices):
        CONTRACT = 'CT', 'Contract'
        FULLTIME = 'FT', 'FullTime'
        FREELANCE = 'FL', 'Freelance'
        INTERNSHIP = 'IP', 'Internship'
        PARTTIME = 'PT', 'Parttime'
    
    job_type_choices = models.CharField(max_length=2, choices=JobTypeChoices.choices, default=JobTypeChoices.FULLTIME)


class JobLevel(models.Model):
    class JobLevelChoices(models.TextChoices):
        STUDENT = 'ST', 'Student'
        INTERN = 'IN', 'Intern'
        ENTRYLEVEL = 'EL', 'Entrylevel'
        MIDLEVEL = 'ML', 'Midlevel'
        SENIORLEVEL = 'SL', 'Seniorlevel'
        COFOUNDER = 'CF', 'Cofounder'
        DIRECTOR = 'DC', 'Director'
        MANAGER = 'MG', 'Manager'
        CEO = 'CEO', 'ChiefExecutiveOfficer'
        CTO = 'CTO', 'ChiefTechnologyOfficer'
        CMO = 'CMO', 'ChiefMarketingOfficer'
        CFO = 'CFO', 'Chief Financial Officer'
        COO = 'COO', 'Chief Operating Officer'
    
    job_level_choices = models.CharField(max_length=3, choices=JobLevelChoices.choices, default=JobLevelChoices.ENTRYLEVEL)


class PostAJob(models.Model):
    job_title = models.CharField(max_length=200)
    job_category = models.ForeignKey(Category, on_delete=models.CASCADE)
    job_skills = models.ForeignKey(JobSkills, on_delete=models.SET_NULL, null=True, blank=True)
    job_salary_range = models.IntegerField(blank=True)
    job_description = models.TextField()
    job_type = models.ForeignKey(JobType, on_delete=models.CASCADE)
    job_location = models.ForeignKey(JobLocations, on_delete=models.CASCADE, default='')
    job_level = models.ForeignKey(JobLevel, on_delete=models.CASCADE)
    job_application_link = models.URLField(max_length=200)
    company_name = models.CharField(max_length=200)
    company_hq = models.CharField(max_length=200)
    company_logo = models.ImageField()
    companys_website = models.URLField(max_length=200)
    company_contact_email = models.EmailField(max_length=200, null=True, blank=True)
    company_description = models.TextField()
    date_created = models.DateTimeField(auto_now_add=True)
    date_updated = models.DateTimeField(auto_now=True)
    # created_by = models.ForeignKey(Profile, on_delete=models.CASCADE)

    def __str__(self):
        return self.job_title

SERIALIZERS.PY

class PostAJobSerializer(serializers.ModelSerializer):
    job_category = CategorySerializer(many=True)
    job_skills = JobSkillsSerializer(many=True)
    job_type = JobTypeSerializer()
    job_location = JobLocationsSerializer(many=True)
    job_level = JobLevelSerializer(many=True)
    created_by = ProfileSerializer(read_only=True)


    class Meta:
        model = PostAJob
        fields = ['id', 'job_title', 'job_category', 'job_skills', 'job_salary_range', 'job_description', 'job_type', 'job_location', 'job_level', 'job_application_link',  'company_name', 'company_hq', 'companys_website', 'company_contact_email', 'company_description', 'date_created', 'date_updated']

    def create(self, validated_data):
        job_category = validated_data.pop('job_category')
        job_skills = validated_data.pop('job_skills')
        job_type = validated_data.pop('job_type')
        job_location = validated_data.pop('job_location')
        job_level = validated_data.pop('job_level')

        post_a_job = PostAJob.objects.create(**validated_data)
#TODO: DON'T KNOW WHAT 
        return super().create(validated_data)

I don’t know how to handle the create method with multi-nested validation that needs to happen (job_category, job_skills, job_skills, job_type, job_location, job_level) in order for a user to create a job posting and would like some guide on this.